[uml-user] "Kernel panic: No init found. Try passing init= option to kernel ."

[Art E. <art...@su...>]

I am puzzled.  

I installed the RPM for user_mode_linux-2.4.12.1um-0 on my Mandrake 7.0
system.

I have gotten tomsrtbt (as modified for UML and downloaded from sourceforge)
to boot fine under UML.  

Emboldened, I obtained Ulrich's Router Construction Kit 
<http://siag.nu/urck/> and got it to boot under UML.

Then, thinking I knew what I was doing, I got the image of fdlinux 
<http://www.fdlinux.com> and tried to boot it under UML.  I got the error
"Kernel panic: No init found.  Try passing init= option to kernel."

I 'mount -o loop ...'ed the ramdisk image, created /dev/ubd[0123456789], and
tried to boot again, specifying the init parameter.  It still fails as shown
below - what am I doing wrong? (Thanks in advance!)


$ linux init=/sbin/init devfs=nomount ubd0=/home/eschen42/bin/fdlinux.img
eth0=ethertap,tap12,fe:fd:0a:06:00:0c,10.6.1.12
tracing thread pid = 9041
Linux version 2.4.12-1um (jd...@um...) (gcc version 2.96 20000731
(Red Hat Linux 7.1 2.96-81)) #2 Thu Oct 11 13:19:34 EDT 2001
On node 0 totalpages: 8192
zone(0): 0 pages.
zone(1): 8192 pages.
zone(2): 0 pages.
Kernel command line: init=/sbin/init devfs=nomount
ubd0=/home/eschen42/bin/fdlinux.img
eth0=ethertap,tap12,fe:fd:0a:06:00:0c,10.6.1.12 root=/dev/ubd0
Calibrating delay loop... 32.35 BogoMIPS
Memory: 32244k available
Dentry-cache hash table entries: 4096 (order: 3, 32768 bytes)
Inode-cache hash table entries: 2048 (order: 2, 16384 bytes)
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
Buffer-cache hash table entries: 1024 (order: 0, 4096 bytes)
Page-cache hash table entries: 8192 (order: 3, 32768 bytes)
POSIX conformance testing by UNIFIX
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Starting kswapd
VFS: Diskquotas version dquot_6.4.0 initialized
devfs: v0.119 (20011009) Richard Gooch (rg...@at...)
devfs: boot_options: 0x0
pty: 256 Unix98 ptys configured
block: 64 slots per queue, batch=8
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
Netdevice 0 : ethertap backend - tap12, IP = 10.6.1.12, ether =
fe:fd:a:6:0:c
loop: loaded (max 8 devices)
Universal TUN/TAP device driver 1.4 (C)1999-2001 Maxim Krasnyansky
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 2048 bind 2048)
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
Initializing stdio console driver
Initializing software serial port version 1
set_umid - mkstemp failed, errno = 13
Failed to initialize management console
VFS: Mounted root (ext2 filesystem) readonly.
Kernel panic: No init found.  Try passing init= option to kernel.